자바 파일 읽기 자바 파일 쓰기 (2019.07.19)
자바파일읽기파일쓰기
파일읽기 파일쓰기
public static ArrayList<String> readFile(File file) throws IOException, Exception {
if (file == null || !file.exists()) {
return null;
}
ArrayList<String> resultList = null;
FileInputStream fileInputStream = null;
InputStreamReader inputStreamReader = null;
BufferedReader bufferedReader = null;
try {
fileInputStream = new FileInputStream(file);
inputStreamReader = new InputStreamReader(fileInputStream, “UTF-8”);
bufferedReader = new BufferedReader(inputStreamReader);
String oneLine = null;
while ((oneLine = bufferedReader.readLine()) != null) {
if (resultList == null) {
resultList = new ArrayList<String>();
}
resultList.add(oneLine);
}
} catch (IOException e) {
throw e;
} catch (Exception e) {
throw e;
} finally {
close(bufferedReader);
close(inputStreamReader);
close(fileInputStream);
}
return resultList;
}
public static boolean writeFile(String filePath, ArrayList<String> stringList, boolean bAppend) throws IOException, Exception {
if (filePath == null || filePath.length() == 0) {
return false;
}
File file = new File(filePath);
boolean bWrite = false;
FileOutputStream fileOutputStream = null;
OutputStreamWriter outputStreamWriter = null;
BufferedWriter bufferedWriter = null;
try {
fileOutputStream = new FileOutputStream(file, bAppend);
outputStreamWriter = new OutputStreamWriter(fileOutputStream, “UTF-8”);
bufferedWriter = new BufferedWriter(outputStreamWriter);
if (stringList != null && stringList.size() > 0) {
String oneLine = null;
int lineCount = stringList.size();
int lastIndex = lineCount – 1;
for (int i = 0; i < lineCount; i++) {
oneLine = stringList.get(i);
bufferedWriter.write(oneLine, 0, oneLine.length());
if (i < lastIndex) {
bufferedWriter.newLine();
}
}
}
bWrite = true;
} catch (IOException e) {
throw e;
} catch (Exception e) {
throw e;
} finally {
close(bufferedWriter);
close(outputStreamWriter);
close(fileOutputStream);
}
return bWrite;
}
private static void close(BufferedWriter bufferedWriter) {
try {
if (bufferedWriter != null) {
bufferedWriter.close();
}
} catch (Exception e) {
// 무시
} finally {
bufferedWriter = null;
}
}
private static void close(OutputStreamWriter outputStreamWriter) {
try {
if (outputStreamWriter != null) {
outputStreamWriter.close();
}
} catch (Exception e) {
// 무시
} finally {
outputStreamWriter = null;
}
}
private static void close(FileOutputStream fileOutputStream) {
try {
if (fileOutputStream != null) {
fileOutputStream.close();
}
} catch (Exception e) {
// 무시
} finally {
fileOutputStream = null;
}
}
private static void close(FileInputStream fileInputStream) {
try {
if (fileInputStream != null) {
fileInputStream.close();
}
} catch (Exception e) {
// 무시
} finally {
fileInputStream = null;
}
}
private static void close(InputStreamReader inputStreamReader) {
try {
if (inputStreamReader != null) {
inputStreamReader.close();
}
} catch (Exception e) {
// 무시
} finally {
inputStreamReader = null;
}
}
private static void close(BufferedReader bufferedReader) {
try {
if (bufferedReader != null) {
bufferedReader.close();
}
} catch (Exception e) {
// 무시
} finally {
bufferedReader = null;
}
}
